I would definitely swap the 4 piece in if i was you. The 40s less on Dark soul cd is probably the best 4 piece bonus going for dps, but if you really wanna be certain about things like this just download the simcraft and run your character through it. It looks complicated and shit but it's actually very easy to use.

Neck from Feng instead of the ones from Will and Galleon?
Bracers from Blade Lord instead of the ones from Zor'lok?
Sword from Tsulong and not the dagger from Protectors heroic elite?

That list is just wrong for Affliction.

Regarding the off-piece I'd go for head from Garalon or chest from Lei-shi.

Yeah you're right. The new list is out but I highly doubt that's the new list is fully correct, regardless. You are missing out on a free 500 int + 320 mastery on the Tsulong sword (part of the legendary quest is you get to add a prismatic socket to your sha touched weapon).

Edit: Reason they take Feng neck is because you need it for hit - the simcraft gear listed is based on getting hit cap as well.